Tricyclic pyridone derivative
CA 2058640 A1 · Owner: Widmer, Ulrich · Inventors: Widmer, Ulrich; Scherschlicht, Richard R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The compound (S)-1-(10-chloro-6,7-dihydro-4-oxo-3phenyl-4H-benzoaquino-lizin- 1 -yl)carbonyl-3-ethoxypyrrolidine of formula I. I, has valuable pharmacological properties and can be used for the treatment or prevention of illnesses. In particular it has a non-, sedating, hypnotic, i.e. sleep-promoting activity and can, accordingly be used for the treatment of sleep disorders.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 31, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.